Rotary two-cycle internal-combustion engine



July 6, 1926. 1,591,467

J. F. CARLSON ROTARY TWOCYCLE INTERNAL COMBUSTION ENGINE F iled Jan. 23,1924 e Sheets-Sheet 1 Nw on 0 H 1/ o. I g m \H H H 9 Q awn 1 I o I a 0II I. l

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J. F. CARLSON ROTARY TWOCYCLE INTERNAL COMBUSTION ENGINE Filed Jan. 23,1924 6 Sheets-Sheet 5 h AW 1736/1 FCqI-Csoh 9 W W- ays July 6 19266ROTARY 'I'WO 6 Sheets-Sheet 4 Filed Jan. 23, 1924 July 6 1926.

J. F. CARLSON ROTARY TWO- NAL COMBUSTION ENGINE Filed Jan. 2

CYCLE INTER 6 Sheets-Sheet 5 July 6,1926. 1,591,467 I 1 J. F. CARLSON 1ROTARY TWO-CYCLE INTERNAL COMBUSTION ENGINE Filed Jan. 23. 1924 eSheets-Sheet a 75/7,, fco'rtson WM acter.

Patented July 6, 1926,

UNITED STATES PATENT OFFICE.

JOHN, F. CARLSON, OF SOUTH BOSTON, 'M-ASSACHUSETTS.'

ROTARY TWO-CYCLE INTERNAL-COMBUSTION ENGINE.

Application filed January This invention relates to an internalcombustion engine of the above indicated char- One of the objects of theinvention is to provide an air cooled gas engine which will have all theadvantages of rotation over reciprocation, while at the same time havingall the advantages of the two-cycle internal combustion engine and willhave its parts concentrically mounted so that it does not get out ofbalance.

Further objects of the invention are to provide a rotary engine of thistype which will have only a single inlet and outlet, :1. single :,valve,and a single spark plug: for the two cylinders; to provide for admittingthe fuel mixture from the forward cylinder into the back one through aby-pass which moves automatically to come, into proper registration atthe; desired time; to-provide' an arrangement of cams, or a single camas .may be desired; for controlling the relative rotation of ,the partsthat correspond with the pistons and cylinders of an ordinary engine; toprovide means for rotating these two parts around the common center in amanner which in a sense is intermittent, that.

is, at times one part rotates faster than the other and at other timesslower; and to rovide positive means for preventing one o the rotaryparts from rotating at. the moment of explosion. The invention alsoinvolvesan improvement in the packing arrangement whereby the rotaryaction can be provided without excessive leakage.

Further objects and advantages of the invention will be describedhereinafter.

Reference is to be had to the accompanying drawings in which Fig. .1 isa plan of a complete engine constructed in accordance with thisinvention; Fig. 2 is a vertical longitudinal sectionalview through theaxis of the driving shaft;

Fig. 3 is a transverse sectional view on the line 33 of Fig. 2 showingthe cylinder in side elevation;

Figs. 4 and 5 are sectional views on the line 4 -5 of Fig. 2 showing therelation of" the piston and c linder at two different points in thecycle 0 operation;

Figs. 6 and 7 are side views of the cam showing the position of the camwhen the cylinder and piston are in positions shown in Figures 4 .and 5respectively;

Fig. 8 is a side view of the ratchet 1 nechanism for preventing reversalpartly in section;

23, 1924. Serial 110. 838,070.

Figs. 11 and 12 are sectional views of the same on the radial lines 11of Figs. 4 and 9 and 12 of Figs. 4 and '10 respectively; and Fig. 13 isan end view of one of the pack ing elements.

I have shown the invention as embodied in a construction comprisingamain fraine 10 having a set of bearings with their centers in a straightline through the center of the frame for supporting a driving shaft 11and a control shaft 12 in alignment with each other. This driving shaftiskeyed in a thimble 13 which is bolted to two cylindrical projections14 each on a rotary end plate 1.5 which constitutes the exterior casingof the engine. This casing 15 is provided with air cooling spacedsurfaces 16 and is. made up of two similar parts spaced from each otherby a cylindrical external wall 17 to which the two circular disc-likeflat walls 15 are bolted so that the latter will be a constant distanceapart. It may bestated at this point that-'a-sing'le spark plu 18 isused supplied with current in any desired way, the electricalconnections being mounted on a bracket 19 secured} in stationaryposition on the bearing 20 in which the cylindrical projection-14rotates. The timer and other elements for securing the spark at theright time 'are not shown as they constitute no art of this invention,

The part 0 the casing 15 which extends a away from the bearing 20 ;onthe opposite side of the device, is-al'soprovided with a substantially clifidri cal .pro'ection 21 having a de resse portion in .w ich is keyeda gas con ucting' annular conduit 22 so that has a flat annular disc 23constituting a part of it and provided with packing ooves 24 on its flatsurface. This annular isc enters an annular groove in a flat flange 25on a second as-conducting conduit 26. This latter conduit is stationaryand the conduit 22 rotates within it so to speak. They both have reistering annular telescopi "grooves from w ich gas can be conductedronn'one to the other. with a gas and air or other fuel mixture inlet 27which although not shown connected up in this rawing, is of courseprovided with any usualmeans for conducting the gas and air previouslymixed. The gas conit rotates with the casing 15. This conduit Theconduit426 is provided ducting channel-in the conduit 26 projects insidethe wall of the corresponding channel in the conduit 22 and the gasentering at 27 will be discharged all the time into the conduit 22. Thisis connected at one point with a radial conductor 30 secured to the sideof the rotary casing 15 and therefore rotating with it in the same wayas the conduit 22. Therefore the gas mixture'can always be conductedfrom the inlet 27 into this conductor 30. This conductor is provided atthe end of it with an automatic yalve 31 communicating with itconstantly and normally held closed by a spring 32. This constitutes theonly valve which this engine has. The gas and air come into. theconductor 30 behind the valve 31 and when the pressure behind the valveovercomes the contrary pressure of the spring 32, it opens the valve. Inother words, when the pressure in the interior of the casing is'belowthe pressure of the fuel mixture in the conductor 30 or at leastmaterially below it, the valve will open and allow the mixture to enterthe casing.

Inside the large cylindrical space within the casing 15 there is locatedon the shaft 12 a disc 33. This disc extends clear across the casing andis provided with annular packing rings 34 held out against the flatsurfaces of the interior of the casing 15 by sprin s 35 behind them. Itwill be obvious there ore that as far as the facts so far described areconcerned, there is an annular s ace between the exterior of the disc 33and the inner surface of the outside wall 17.

Furthermore, the cross section of this annu lar space is substantiallysquare in the form shown in the drawing. On the disc 33, fixedly securedby bolts 36, is an abutment 37. This has the same cross section as thespace just described whatever that may be and is made hollow for lihtness. It is also provided, as shown in i s. 9 and 11, with radialgrooves 38 aroun three sides of it in which are located springs 39, eachspring shown as being bent outwardly at the four corners of the crosssection of the abutment and bent inwardly at two intermediate points 40extending to the bottom of the roove. These springs press outwardly atour corners agalnst a pair of interlocking L-shaped packing pieces 41and tend to force these packin pieces against the two opposite fiatwalls 0 the annular space and also against the cylindrical outer wall.packing pieces are shown as arranged in pairs at the two ends of theabutment.

vent gas escaping along the abutment from one end to the other.

Secured to the casing 15 ormore specifically to the outer wall 17thereof, by means of bolts 43 is a piston 44 having very largely thecharacteristics of the abutment 37. It is to be'observed, however, thatthe abutment is These The packing rings are located at the endsto'presecured to the disc at its inner circumference while the piston issecured to the cylinder or casing on its outer circumference. Thereforewhile the abutment needs packing on its outer circumference, the pistonneeds packing on its inner circumference which engages the disc 33 andrelatively oscillates thereon. For this purpose I have shown in Figs.10' and 12 a pair of longitudinal rooves 45 provided in the innercircumference of the piston 44 near one end. In these grooves arearranged packing pieces 46 and springs 47 behind them for forcing thesprings inwardly against the surface of the dlsc 33. This piston ishollow also and it differs from the abutment 37 in that this abutment isclosed at both ends while the piston is closed only at its rear end by awall 48. Its front end 49 is left wide open.

I have shown a b -pass 50 in the disc 33 for conducting gas f om aposition in front of the piston to a position behind it, and

the wall of the piston 44 is provided with,a

er-foration 51 adapted to register with this y-pass when the arts comein the osition shown in Fig. 5, t e purpose of which will appearhereinafter. An exhaust opening 52 is provided at a certain pointthrough one of the walls 15. This constitutes the entire construction ofthe parts that correspond with the ordinary pistons and cylinder.

It has been stated that the casing 15 rotates and it is secured to thedriving shaft 11 so that it is the rotation of this casing that isutilized to drive this driving shaft. It is called a driving shaft,although driven by this machine, because it drives any mechanism that isto be connected with it. The disc 33 is also rotary as will ap ear.

The shaft 12 extends in through t e cylindrical projection 21 andthrough the center of the disc 33 and beyond it into the pro jection 14.The disc 33 is provided with a ong hub 55 extending from it in bothdirections and having hearings on the inner surfaces of the projections14 and 21.

On the shaft 12 to rotate about its center is keyed an arm 56 projectingradialliy. Freely pivoted to this arm by a pin or stud b is a rollerlink 57 which is provided with a cam roller 58 freely mounted thereon atits outer end. This cam roller en ages an inside cam 60 which is mountedinside a cason the same axis but rotatable by different a bearing forthe.

' ment of the roller inwardl projection60 on the cam, and then as itmeans so that they can be rotated at differentspeeds. This cam 60 is ofsuch a nature as to move-the roller 58' inwardly once during'a completerevolution when in the position shown in Fig. 6. This movechanges theshape of the quadrilateral gure a b 0 05 formed by the two arms 56 and"59 and the two links 57 and 63, andmodifies this four sided fi re so asto change the relative s eed 0 rotation'of the disc and casing.v

f course the rest of the cam surface is so. designed as to control thatrelationship in the way that is desired as will appear. "In. thedrawings shown herein, centrifu al force is depended upon to force therol er 58 outwardly and keep it always .in contact with theinnensurfaeecf the cam 60,but if necessary spring mean'scan be appliedfor that pur ose.

In or er to prevent the shaft 12 from turning backwardly, I haveprovided ratchet means. shown in Figs. 2 and 8 comprising a ratchet disc66 keyed on the shaft 12 and shown as havin two ratchet teeth 67although an convenient number can be used. A couplb pivoted on studs 69mounted on the stationary casing 61. '-The studs are provided with COllsprings 70 for holding the pawls against the face of the ratchetdlscand'preventing rotation backwardly.

The whole engine can be lubricated by introducing a lubricantinto acentral oil passage 73 in the shaft 12, the plug '74 bemg removed for'that pur se. il passages 75 are shown for istributing the lubricant tovarious surfaces.

Operation.

Assuming thatt'he engine is started b a plosion takes place with the.parts in the position shown in that figure, the roll 58 is pushedinwardly by encountering an inward continues to move around the orbit ofthe cam, which orbit throughout [about a quarter circle in the region 60is concentric with the stud 6 connecting the parts 56 and 57. Thereforethe rotation can take place throughout a quarter circle without movingthe arm 56 and therefore the disc 33 and the abutment 37 as there 'is noforce to;

move the abutment backwardly but the force of the explosion. This .isprevented at this e ratchet mechanism one tooth of instant. They remainstationary in the position inwhich the abutment is directly of ratchetpawls 68 are distance apart by the two pivots b and 0 .over and concealsthe exhaust port 52 but the piston 44 is free to rotate and does rotateby the entire force of the explosion throu bout this quarter circle fromthe position s ownin F1g.-4 to that shown in Fig. 70

,5. The abutment 37 has covered the inside port 52 all this time butjust before the parts get to the position shown in Fig. 5 the insideport comes out from under the abutment, rotating of course as a part ofthe 7 5 casing. This allowsthe spent gases to ex-- 'haust into. the air.

As .will appear later, the movement of the parts to the position shownin Fig. 4 involves the rotation of the disc 33'and the abutment 37 inthe direction of the arrow and reduces the pressure in the spaceregistering with the 1nlet valve 31.- Therefore this valve opens and thefuel mixture is adf mitted to this s ace. Now when the piston gets tothe posltion shown in Fig. 5 after the explosion the explosive mixturein front of it and w thin it has been artly com-' pressed as will beapparent. ow the by pass50 is opened by coming into. reg'istra tion withthe port 51'and the compressed gases are forced into the space behindthe piston. Just before it gets to the position shown in this figure,the, roll 58 encounters a surface 60 of the cam which is not concentricwith the stud on which the arm 57 'is pivoted and moves inwardly towardthe center slightly. Thereafter the arm56 and the shaft 12 are swungforward a little and the abutment '37 is moved forward from the positionshown in Fig. 4. Therefore the port 52 is covered up just before thegIases are admitted through the by-pass 50.

ow-. the roller 58 works along the arc 60 which continuously forces thetwo pivot. pointsb and c'apart In other words, the disc 33 movesv in thecasing 15 during this eriod and rotates faster, further compressmg thecharge in the chamber designated E until the parts come up to thatposition. The no final compression occurs when the roller 58 is on thepoint of the projection 60 of the. cam. In other words, the relationbetween the two rotary parts is controlled by the 15 which is controlledby the shape of the-cam.

It is to be remembered that these parts never rotate backwardly, alsothe outer casing is never stationary. It alwaysrotates at con-'stant'speed. The disc 33 and abutment 37 rotate only inone directionbut intermittently, being entirely stopped during'about a quarter of arevolution duringgexplosion. he rest of the time they rotate faster than'the'casing and gradually c'atchup with it and overtake it. i In thisway, a rotary engine is provided of the internal -'combustion. type' inwhich the relationshi of thefrotation of the two I rotating partslscontrolled by very simple ,provided w1th a sing mechanism. It is notlikely to get out of order or to be subjected to" any great wear. Onlyone spark plug, valve, inlet and outlet are required.

.I am aware of the fact that the same re sults may be secured by twocams and two sets of rollers and-levers, one to take each part of thestroke, but I prefer a single one as shown.

Although I have illustrated and described only a single form of theinvention I am aware of the fact that modifications can be made thereinby any person skilled in the art without departin from the scope of theinvention as expresse in the claims. Therefore I do not wish to belimited to all the details of construction herein shown and described,but what I do claim is 1. In a two cycle internal combustion rotaryengine, the combination with a. casing havin a ower driven shaftconnected thereto an a apted to rotate to deliver power,

le automatically operating inlet valve, a single exhaust port openinginto the air and a single spark plug, and a piston secured to the innerwall thereof, of a circular disc rotatable in the casing and providedwith an abutment secured to the circumference thereof, the piston andthe abutment fitting the space between the disc and the casing, saidengine having a bypass for conducting an explosive mixture from thefront of the iston to the rear of it, and means for contro ing therelative speeds-of rotationof the casing and disc for s acing theabutment and piston to provide cradmission, compression, explosion andexhaust.

2. In a two cycle internal combustion rotary engine, the combinationwith a round casing having a power driven shaft concentrically connectedthereto and adapted to rotate constantl in one direction to deliverpower, provided with asingle automatically operating inlet valve, asingle exhaust port openin into the air and a single spark plug, andahollow arcuate piston secured to the inner wall thereof closed at oneend and open at the other, of a circular disc independently rotatable inthe casing and concentric therewith and provided with an arcuateabutment secured to the circumference thereof, the piston and theabutment fitting the space between the disc and the casing, said dischaving a by-pass therethrough for conducting an explosive mixture fromthe interior of said piston to a position beyond its end, and means forcontrolling the speed of rotation of the disc relative to the casing toprovide for admission, compression, explosion and exhaust.

3. In a two cycle internal combustion rotary engine, the combination ofa casing for receiving an explosive mixture, mounted inside said casingand fixed thereto, said piston being hollow and being open at a pistonits forward end and closed at its read end, a disc located in saidcasing, an abutment fixed to said disc, said abutment and piston eachfitting the space between the disc and casing, means for rotating thedisc from the casing and varyin that rotation for the purpose ofsecuring a mission, com ression, and exhaust, an admission valve and aspark plug movable with the casing, and means whereby an explosivecharge introduced into the casing in front of the piston will betransferred from the inside of the piston to a space in the. casingbehind the .piston and thereafter compressed between the forward end ofthe abutment and the solid rear end of the piston.

4. In a two cycle internal combustion rotary engine, the combinationwith a casing having a power driven shaft connected thereto and adaptedto rotate to deliver power, provided with a single spark plug, and apiston secured thereto, of a circular disc rotatable in the casing andprovided with an abutment, the piston and the abutment fitting the spacebetween the disc and the casing, said engine having a by-pass forconducting an explosive mixture from the front of the piston to the rearof it, means for exploding a charge once during a complete rotation, andmeans for controlling the relative speeds of rotation of the casing anddisc by spacing the abutment and piston to provide for admission,compression, explosion and exhaust.

5. In an internal combustion rotary engine, the combination of a rotarycasing having a space therein for an explosive mixture, a isc withinsaid casing, a piston fixed to the casing, an abutment fixed to the discboth located in the space between the disc and casing, said piston beinghollow and having a solid rear end and an open front end for thereception of an explosive mixture when it is introduced into the spacebetween the casing and disc. 7

6. In an internal combustion rotary engine, the combination of a rotarycasing having a space therein for an explosive mixture, a'concentricdisc within said casing, a piston fixed to the casing, an abutment fixedto the disc filling a part of the space between the disc and casing andof the same cross section as the cross section of said space, saidpiston being hollow and having a solid rear end and an open front endfor the reception of an explosive mixture when it is introduced into thespace between the casing and disc, the inner wall of said piston havinga port and the disc havin to register with the said the rotation of theparts, said by-pass being adapted to deliver gases from the interior ofthe piston, when the by-pass registers with the port, to a oint beyondthe closed end of the piston, w ereby the gases will be port at a pointin a bypass adapted forced into the space behind the piston and becompressed by the'advancing abutment.

7. In an internal combustion rotary engine, the combination of arotarycasing aving a space for receiving an explosive mixture, a discwithin-said-casing, a hollow piston fixed to the casing, an abutmentfixed to the disc of the same'cross section as the cross section of thespace between the disc and casing, said piston having a port and saiddisc having a by-pass adapted to regisshaft to rotate it constantly, adisc within said casing fixed 'to and rotatable .by the control shaft, astationary fuel inlet connectedwith an annular conduit fixed withrespect to said casing and having a complete circular recess registeringconstantly with the interior of said inlet and rotatable with respectthereto, a'conductor extending from a. po 1nt in'said conduit to a pointon said casing at which a ort is located for the admission of the exposive mixture to the casing, a valve for controlling said port, andmeans whereby the valve is operated to permit the mixture to come throuh it'into the casing onceduring each revo ution of the casing. y

9. 11 an internal combustion engine, the

combination of a driving shaft and a control shaft in alignment, with acircular casing fixed to the driving shaft to rotate it constantly, acircular disc within said casing fixed to the control shaft to rotatewith thecontrol shaft, a stationary casingsurrounding said controlshaft,-a stationary fuel inlet connected with said casing, an annularcon.- duit fixed withv respect to the first named casing and having acomplete circular recess registering constantly with the interior ofsaid inlet and rotatable with respect thereto, packing rings locatedbetween the rotary Y conduit and stationary inlet, a radial conductorextending from a point in said conduit to a point on the circumferenceof said casing at which a ort is located for the admission of the exposive mixture to the casing, a valve for controllin said port, and a srin for normally ho ding said valve 0 ose but adapted to yield under areduction of pressure inside the casing to permit the mixture to comethrough it.

10. In an internal combustion rotary engine, the combination with acasing for receiving the explosive mixture and transwhereby the controlmitting power, a' control shaft concentric with said casingand.extending into it, and a disc fixed on the control shaft located insaid casing, said casing having a projecting portion provided with an'arm extending madially from the center thereof, the control arms duringeach cycle of operationsgga stationary casing surrounding said controlshaft, a ratchet pawl pivotedon the-stationary casin and 'a ratchetwheel fixed on the control s aft for engagement with saidpawl to preventrotation of the control shaft reversely.

11. In an internal combustion rotaryengine, the combination with acasing for receiving the explosive mixture and transmitting power, acontrol shaft, a disc fixed ing, said casing having alprojecting portionprovided with an arm extending therefrom,

'the control shaft having as arm extending therefrom, means forconnecting said arms together so that they are capable of shiftingcircumferentially with respect to each other,-

means for controlling the relative location. of said arms during eachcycle of operatlons,

on the control shaft and located in said casa ratchet pawl pivoted on astationary pivot,

and a ratchet wheel fixed on the control shaft for engagement with said,pawl to prevent rotation of the control shaft I reversely.

12. In a rotary internal combustion engine, the combination of a rotarycasing for receiving theexplosive mixture and transmitting power, a disclocated in said casmg,

a control shaft on which the disc is fixed,

an a on said'casin an arm on said control shaft, a pair 0 links (plvotedto the ends of said arms and pivote to each other,

and means located in fixed position and adapted to be engaged by one ofsaid links for controlling the 1 shape of the fi re formed by the centerand the three pivotal points of the links, shaft will be rockedrelatively to the casing during each rotation of the casing.

13. In a rotary internal combustion engine, the combination of a rotarycasing for receiving the explosive mixture"- and transmitting power, adisc located in said casing and concentric therewith, a control shaft onwhich the disc is fixed, the casin having a cylindrical projectionat oneen a radial arm on said projection, a radial arm of the control s aftsaid cam.

14. In a rotary internal combustion engine, the combinat10n of acasmgfor receiving the explosive mixture and transmitting the powerfarotary disc located therein, a piston carried by said casing, anabutment on the disc, the piston and abutment extending -across thespace between the disc and casing and providing a fuel compression spacebetween them, a control shaft on which the disc is fixed, an arm proecting from the control shaft, a projection on the casin at one. endhaving anarm pro ecting there rom, two links pivotally connected to theends of said arms and to each other, a roller carried b one of saidlinks, and a cam in position or engagement with said roller forcontrolling the distance of the roller from the center of the controlshaft, whereby when the roller is forced inwardly the two arms will beforced apart and the disc will rotate faster than the casing.

15. In a rotary'internal combustlon en- 'ne,' the combination of acircular casing or receiving the explosive mixture an transmitting thepower, a rotary disc located therein and extending across the casing, apiston carried by sai casing, an abutment carried by the disc, a controlshaft on which the disc is fixed located concentrically with respect tothe disc and easing, an arm project ingradially from the control shaft,a projection on the casing at one end having an arm projectingradiallytherefrom, two links pivoted to the ends of said arms and pivoted "toeach other, a roller carried by one end of one of said links, and astationary internal cam in position for engagement with said roller forcontrolling the distance of the roller from the center'of the controlshaft,

whereby when the roller is forced inwardly the two arms will be forcedapart and the disc will rotate faster than the casing.

16. In a rotary internal combustion engine,

the combination of a casing for receiving the explosive mixture andtransmittin the power, a rotary disc located therein, a plston carriedby said casing, an abutment carried V by the disc and extending acrossthe s ace an arm projecting therefrom, two

between the disc and casing, a control s aft on which the disc is fixedlocated concentri cally with respect to the disc and casin an armprojecting from the control shag a projection on the casing at one endhaving links pivotally connected to the ends of said arms and to eachother, a roller carried by one of said links, and a stationary cam inosition for engagement 'with said roller or cont olling the distance ofthe roller from the center of the control shaft,

7 arms and pivote said "cam having most of its circumference so shapedas to cause the disc to rotate faster than the casing and provided withan inwardly extending projection for causing the disc to rotate rapidlytoward the end ofthe compression stroke to complete the compression andprovided with a portion concentric with the control shaft just beyondsaid inward projection to hold the disc stationary throu bout a por:tion of a revolution to keep tie abutment stationary while the explosionis taking place and force the piston and the casing forward.

17. In a rotary internal combustion engine, the combination of acircular casing for =rece1ving the explosive mixture and transmittingthe power, a rotary disc located piston carriedby the casing and spacedfrom the abutment circumferentially, the piston and abutment extendingacross the space between' the disc and easing, a control shaft on whichthe disc is fixed located concentrically with respect to the disc andeasing, an arm projecting radially from the control shaft, a projectionon the casing at one end having an arm projecting radially therefrom,two links Cpivoted to the ends of said to each other, a roller carriedby one end of said links, and a stationary cam in position forengagement with said roller for controlling the distance of the rollerfrom the center of the control shaft being provided with an inwardlyextending projection for causing the disc to rotate rapidly toward theend of the compression stroke to complete the compression and providedwith a just beyond said inward projeci0n'to hold the disc stationarythroughout a portion of a revolution to keep the abutment stationarywhile the explosion is taking place and force the piston and the casingforward. v 18. In a rotary internal combustion engine, the combinationof a circular casing for receiving the explosive mixture andtransmitting the power, a rotary disc located therein, anabutment-carried by said disc, a piston carried by the casing and spacefrom the abutment circumferentially, the piston and abutment extendingacross the space between the disc and easing, a control shaft on whichthe disc is fixed located concentrically with respect to the disc andcasing, an arm projecting from the control shaft, a projection on thecasing at one end having an arm projecting therefrom, two links pivotedto the ends of said arms and pivoted to each other, and a cam inposition for engagement with one of said links for controlling theoperatidn thereof being pro"- vided with an inwardly extendingprojection for causing the disc to rotate rapidly toward the end of thecompression stroke to complete the compression and provided with aportion concentric with the control shaft just beyond said inwardprojection to hold the disc stationary throu bout a portion of arevolution to keep the a utment stationary -,while the explosionistaking place and force the piston and the casing forward.

19. In a rotary internal combustion enine, the combination of a rotarycasing or receiving the explosive mixture and transmitting power, a disclocated in said casing, a controlshaft on which the disc is fixed, anarm on said casing, a'control shafton which the disc is fixed, an arm onsaid casing, an arm on said control shaft, a pair of links pivoted tothe ends of said arms and pivoted to each other to 'form a quadrilateralfigure, and means for controlling the shape of the figure to rock thecontrol shaft relatively to the'casing during each rotation of thecasing.

In testimony whereof I have hereunto affixed my signature.

JOHN F; OARLSON.

